I've had a few, well three actually in my reefs over the years, always one at the time. I've always though they were Diphreutes but I've had some folks tell me the ones I've had were Acuminatus. You can see the one I currently have in my avatar (at least at the time of this posting). Which ever side of that debate you are on, what I can tell you is that mine have been SPS and clam safe good with LPS such as trumpets, favia, frog spawn and tourch as well. The first two were fine with zoas as was the 3rd until a new fish demonstrated how tasty zoas can be, now this one eats zoas! They are constant rock picker and will steal food from corals, this can cause reduction in PE, but I've not seen any direct damage.
All mine were purchased as small as I could find them and the one I have now has been in several tanks over the 3 years + I've kept him, a 100, a 120, a 90. Given lots of open space they "OK" for now in these small tanks... for now. I have a 210 and a 375 sitting dry and ... hopefully ... one day soon, one of them with hold SW and this fish along with a couple more . They are beautiful to watch. But they need room long term.
They get real big! I know a reefer with two that are just HUGE! Nearly 9" and I don't know that any reference says they'll get that big in aquariums. But they can!
HTH